Instead of a new fuse, fashion a pair of wires you can plug in and connect the other ends to a small 12 volt light bulb. A brake light bulb will work fine. When the short is present, the bulb will be full brightness. When the short is gone, the bulb will go out or be dim.
Now you can move stuff around and disconnect things while watching the bulb. Look for wires that are rubbed through against the body sheet metal, and look for wires that had become hot and melted to other wires or metal brackets under the fuse box. It's not likely the computer will cause a problem that is affected by moving it, but he wiring going to it could.
Thursday, January 7th, 2021 AT 3:25 PM